diff --git a/panels/notification/common/dbaccessor.cpp b/panels/notification/common/dbaccessor.cpp
index 6ef958e36..2a5b2fc76 100644
--- a/panels/notification/common/dbaccessor.cpp
+++ b/panels/notification/common/dbaccessor.cpp
@@ -9,6 +9,7 @@
 #include <QDir>
 #include <QElapsedTimer>
 #include <QLoggingCategory>
+#include <QMutexLocker>
 #include <QSqlDatabase>
 #include <QSqlError>
 #include <QSqlQuery>
@@ -173,6 +174,7 @@ qint64 DBAccessor::addEntity(const NotifyEntity &entity)
 {
     BENCHMARK();
 
+    QMutexLocker locker(&m_mutex);
     QSqlQuery query(m_connection);
 
     QString columns = QStringList{
@@ -224,6 +226,7 @@ void DBAccessor::updateEntityProcessedType(qint64 id, int processedType)
 {
     BENCHMARK();
 
+    QMutexLocker locker(&m_mutex);
     QSqlQuery query(m_connection);
 
     QString cmd = QString("UPDATE %1 SET ProcessedType = :processed WHERE ID = :id").arg(TableName_v2);
@@ -240,6 +243,7 @@ NotifyEntity DBAccessor::fetchEntity(qint64 id)
 {
     BENCHMARK();
 
+    QMutexLocker locker(&m_mutex);
     QSqlQuery query(m_connection);
     QString cmd = QString("SELECT %1 FROM notifications2 WHERE ID = :id").arg(EntityFields.join(","));
     query.prepare(cmd);
@@ -260,6 +264,7 @@ int DBAccessor::fetchEntityCount(const QString &appName, int processedType) cons
 {
     BENCHMARK();
 
+    QMutexLocker locker(&m_mutex);
     QSqlQuery query(m_connection);
     if (appName == DataAccessor::AllApp()) {
         QString cmd = QString("SELECT COUNT(*) FROM notifications2 WHERE (ProcessedType = :processedType OR ProcessedType IS NULL)");
@@ -287,6 +292,7 @@ NotifyEntity DBAccessor::fetchLastEntity(const QString &appName, int processedTy
 {
     BENCHMARK();
 
+    QMutexLocker locker(&m_mutex);
     QSqlQuery query(m_connection);
     QString cmd =
         QString(
@@ -314,6 +320,7 @@ QList<NotifyEntity> DBAccessor::fetchEntities(const QString &appName, int proces
 {
     BENCHMARK();
 
+    QMutexLocker locker(&m_mutex);
     QSqlQuery query(m_connection);
     if (appName == DataAccessor::AllApp()) {
         if (maxCount >= 0) {
@@ -360,6 +367,7 @@ NotifyEntity DBAccessor::fetchLastEntity(uint notifyId)
 {
     BENCHMARK();
 
+    QMutexLocker locker(&m_mutex);
     QSqlQuery query(m_connection);
     QString cmd = QString("SELECT %1 FROM notifications2 WHERE notifyId = :notifyId ORDER BY CTime DESC LIMIT 1").arg(EntityFields.join(","));
     query.prepare(cmd);
@@ -383,6 +391,7 @@ QList<QString> DBAccessor::fetchApps(int maxCount) const
 {
     BENCHMARK();
 
+    QMutexLocker locker(&m_mutex);
     QSqlQuery query(m_connection);
     if (maxCount >= 0) {
         QString cmd("SELECT DISTINCT AppName FROM notifications2 ORDER BY CTime DESC LIMIT :limit");
@@ -413,6 +422,7 @@ void DBAccessor::removeEntity(qint64 id)
 {
     BENCHMARK();
 
+    QMutexLocker locker(&m_mutex);
     QSqlQuery query(m_connection);
 
     QString cmd("DELETE FROM notifications2 WHERE ID = :id");
@@ -431,6 +441,7 @@ void DBAccessor::removeEntityByApp(const QString &appName)
 {
     BENCHMARK();
 
+    QMutexLocker locker(&m_mutex);
     QSqlQuery query(m_connection);
 
     QString cmd("DELETE FROM notifications2 WHERE AppName = :appName");
@@ -449,6 +460,7 @@ void DBAccessor::clear()
 {
     BENCHMARK();
 
+    QMutexLocker locker(&m_mutex);
     QSqlQuery query(m_connection);
 
     QString cmd("DELETE FROM notifications2");
diff --git a/panels/notification/common/dbaccessor.h b/panels/notification/common/dbaccessor.h
index da7db81b2..7535fa040 100644
--- a/panels/notification/common/dbaccessor.h
+++ b/panels/notification/common/dbaccessor.h
@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <QMutex>
 #include <QObject>
 #include <QSqlDatabase>
 
@@ -50,6 +51,7 @@ class DBAccessor : public DataAccessor
     NotifyEntity parseEntity(const QSqlQuery &query);
 
 private:
+    mutable QMutex m_mutex;
     QSqlDatabase m_connection;
     QString m_key;
 };
diff --git a/panels/notification/server/notificationmanager.h b/panels/notification/server/notificationmanager.h
index bdbe1354c..51c091731 100644
--- a/panels/notification/server/notificationmanager.h
+++ b/panels/notification/server/notificationmanager.h
@@ -30,9 +30,9 @@ class NotificationManager : public QObject, public QDBusContext
     bool registerDbusService();
 
     uint recordCount() const;
-    void actionInvoked(qint64 id, uint bubbleId, const QString &actionKey);
-    void notificationClosed(qint64 id, uint bubbleId, uint reason);
-    void notificationReplaced(qint64 id);
+    Q_INVOKABLE void actionInvoked(qint64 id, uint bubbleId, const QString &actionKey);
+    Q_INVOKABLE void notificationClosed(qint64 id, uint bubbleId, uint reason);
+    Q_INVOKABLE void notificationReplaced(qint64 id);
 
     void removeNotification(qint64 id);
     void removeNotifications(const QString &appName);
diff --git a/panels/notification/server/notifyserverapplet.cpp b/panels/notification/server/notifyserverapplet.cpp
index 43c6b58f8..4c9857ea6 100644
--- a/panels/notification/server/notifyserverapplet.cpp
+++ b/panels/notification/server/notifyserverapplet.cpp
@@ -61,17 +61,17 @@ bool NotifyServerApplet::init()
 
 void NotifyServerApplet::actionInvoked(qint64 id, uint bubbleId, const QString &actionKey)
 {
-    m_manager->actionInvoked(id, bubbleId, actionKey);
+    QMetaObject::invokeMethod(m_manager, "actionInvoked", Qt::AutoConnection, Q_ARG(qint64, id), Q_ARG(uint, bubbleId), Q_ARG(QString, actionKey));
 }
 
 void NotifyServerApplet::notificationClosed(qint64 id, uint bubbleId, uint reason)
 {
-    m_manager->notificationClosed(id, bubbleId, reason);
+    QMetaObject::invokeMethod(m_manager, "notificationClosed", Qt::AutoConnection, Q_ARG(qint64, id), Q_ARG(uint, bubbleId), Q_ARG(uint, reason));
 }
 
 void NotifyServerApplet::notificationReplaced(qint64 id)
 {
-    m_manager->notificationReplaced(id);
+    QMetaObject::invokeMethod(m_manager, "notificationReplaced", Qt::AutoConnection, Q_ARG(qint64, id));
 }
 
 QVariant NotifyServerApplet::appValue(const QString &appId, int configItem)